Pump and compressor



J. ZWICKY.

PUMP AND COMPRESSOR.

APPLICATION FILEDJUNE 13, um.

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APPLICATION. FILED JUNE 13, I917.

Patented May 4,1920. I 3 $HEET$$HEET 2 J. ZWICKY.

PUMP AND COMPRESSOR.

APPLICATION 11.20 JUNE 13, 1917.

Patenwd May 4, 1920.

3 SHEETS-SHEET 3f .ll hrnerg JEAN ZWICKY, OF SOUTH TOTTENHAM, ENGLAND.

PUMP AND COMPRESSOR.

Specification of Letters Patent.

Patented May 4, 19 20.

Application filed June 13, 1917. Serial No. 174,577.

To all whom it may concern:

Be it known that I JEAN ZwroKY, a subject of the King of Great Britain and Ireland, residing at 66 Chester road, South Tottenham, in the" county of Middlesex, England, have invented new and useful Improvements in Pumps and Compressors, of which the following is a specification.

This invention relates to pumps and compressors, and in particular to improvements upon and further developments of the constructions described in my former U. S. Patent No. 1203682. Those constructions comprised two working'cylinders in axial alinement with a piston in each upon a common piston rod, and with ports and means controlling themv located between the cylinders, the ports allowing egress from the cylinders on all sides. In certain of these constructions the port controlling means comprised spring pressed valves incombination with a reciprocating member covering or uncovering ports upon a cylindrical surface.

By my present invention I am enabled further to simplify the construction of pumps and thelikeofthis class by dis-' pensingwith the reciprocating member and controlling both inlet and outlet ports for both cylinders by means of disk valves; and moreover to do so while still retaining the advantage of the coaxial cylinders with ports and port controlling meanslocated between them. w

One main purpose of my invention, there:

fore, is the provision of a valve structure to be located between two cylinders which will control ingress into and egress from each of the cylinders by means of disk valves affording the fluid as direct and unencumbered a path as possible. By this provision I obtain a pump capable of dealing with' liquids that are muddy, or otherwise con-' tain solid particles.

Such a valve structure is made without involving complicated castings orany difliculty in assembling by constructing it in two concentric parts. Inner ported members which carry the disk; valves are surrounded by a junction member or ring which completes channelswith as little restriction as possible between the annular ports and lateral inlet and outlet openings.

I have also held in view in the further development of this pump the desirabilitybled and. therefore readily taken to pieces .when necessary. Both my central valve structure and also my whole pump in the most improved form-arecapable of ready assembly with a minimum number of bolts or studs.

It has been a further object of my forme inventions to reduce, as far as possible, the number of fluid-tight joints, especially sliding or moving joints, that the pump or the like requires; which end has been largelyattained by the location of a double set of valves between two pistons. By the addition of a further set of valves and a fixed cover plate I am now enabled to make one cylinder double-acting without increasing the number of'sliding joints. I form upon the outside of the double-acting cylinder two simple passages or conduits, by which fluid may be conveyed from the annular inlet and outlet ports at the end of 'the cylinder closed by the cover to the inlet and outlet openingsrespectively in the central valve structure.

ith the above mentioned purpose of ready assembly I form upon the single acting cylinder a flange to which the cover of the double-acting cylinder is secured. A single set of studs is thus made to serve to hold the cover upon the double-acting cylinder, to hold the double-acting cylinder upon the single-acting cylinder,and to grip the valve structure between the cylinders.

These and other features of my invention will be found described in detail hereinafter and pointed out in the appended claims.

Two embodiments of the invention are shown in the annexed drawings in which-- vFigure l is a longitudinal section of a treble-acting vertical compressor constructed in accordance with the invention.

Fig. 2 is a plan, and

Fig. 3 a vertical section of the junction member or ring of the valve structure.

Fig. 4 is a plan from underneath of the cover closing the double-acting cylinder.

Fig. 5 is a longitudinal section of the second embodiment of the invention.

The pump of Figs. 1 to 4 comprises 00- anial cylinders 3 and 4 respectively contain ing pistons 1- and 6 which are connected together by a piston rod 7. Both pistons are driven through a connecting rod 2 attached to the piston 1, and desi ned to be operated by power from a shaft 3(, which may carry a fly-wheel, through acrank 38. The singleacting cylinder 3 is formed in one with a crank casing 62 to which access may be had through an inspection door 63. The doubleacting cylinder 4 is closed at its top by the cover or cap 61. Between the cylinders 3 and 4 there is located a valve structure formed in two main portions. The inner or ported members are built upon a casting interposed between cylinders 3 and 4. Outlet valves consisting of rings 55, 56 of dermatin, woodite, sheet metal or the like are secured upon this casting by the lips of brass bosses 8 and 8 which are screwed one into the other from opposite sides of the casting. In this construction theoutlet valves and 56 seat upon the edge of the cylinders 3 and 4. Annular seatings 51 and 52 for the inlet valve are formed upon the bosses 8 and 8 Disk inlet valves 12 and 13 of similar material to the outlet valves-are held upon these seatings by means of a flanged brass sleeve 53 fitting the piston rod 7 and 53 and the boss 8 and the valve-13 is similarly gripped between the collar 54 and the boss 8. The outer part of the valve structure is a junction member or ring46, the construction of which is more fully seen in Figs. 2 and 3. This is designed to complete with the inner ported members and the cylinders as directand unrestricted channels as possible between the inlet and outletvalvesand lateral inlet and outlet openings respectively.

In this construction of pump the upper cylinder 4 is intendedto be double acting.

A second set of valves is, therefore, provided at. its top. A ring 60, corresponding to one half of the casting 45, is secured between the cover 61and the cylinder andcarries anoutlet valve 64 seating upon the end of the cylinder. This valve is retained in position by the lip of a boss substantially similar to 8 or 8*, which forms also the seating for the inlet valve 59, and this valve in turn is held upon the seating by a bos 58 secured upon the cover.

Integral with the cylinder 4 there is formed a simple casting 39 the interior of i which is divided by a diametral partition 76 so that it forms .two simple channels 40 and 41, of which the former serves as an inlet space and the latter as a delivery or outlet space. Around the ends of the cylinder 4 are formed outlet channels 49, 57, by which the ports closed by the valves 56 and 64 respectively are connected with the out let space 41. A similar channel 50, at the end of the cylinder 3, connects the outlet port controlled by valve 55 with the space to the left of thewall 47 in the junction member 46. The inlet valve 59 connects through the inlet space 40, and the inlet valves 12 and 13 through the passages 48, with the inlet opening in the ring 46.

The assembly of the valve structures has already been sufliciently indicated. The assembly of the whole pumpis effected by a pair of studs 43, 44, which pass through the outlet and inlet spaces respectively and through the junctionmember 46, and which secure the cover 61 of the double-acting cylinder to the flange 42 of the'single-acting cylinder. Between these two members the studs secure in" position the double-acting cylinder and the valve structure's.

In the modification shown. in Fig. 5, so far as the parts correspond with those of the structure shown in Fig. 1, they are distinguished by corresponding references with the prime mark attached. This modification is a horizontal double-acting pump, shown as operable by hand through a handle 65 which can be inserted in a socket '66 pivoted at 68 and joined to the connecting rod 2 at. 67. The valve structure is still located between the cylinders and is still formed in two main portions, namelyan outer junction member 69 and an inner ported structure carrying inlet and outlet valves for both cylinders. This structure has coned surfaces 7 O, 71 which make joint with the junction member 69. The inlet and outlet valves are not in this instance concentric, but are still co-aXial and-are of the same construction a'sbe'fore. The casting 45"is still held'between the two cylinders and still provides partition walls between the inlet and outlet ports. It is in this instance constructed in two portions, between which is gripped a member fittin the piston rod 7 and having guards 74, '5 which retain in place .upon the casting 45" the outlet valves 55', 56. The inlet valves 12 and.

13' are retained upon the casting 45" by guards 72', 7 3 which screw upon its ends. What I claim is: I

1. A pump or compressor comprising in combination a pair of cylinders in axial .alinement a concentric jacket surrounding the leading cylinder,a diametric partition in said jacket dividing the same internally into two spaces, aninlet connection to one of said spaces, and an outlet'conne'ction to the other of said spaces, a valve casting uniting said cylinders, valves in said valve cast ing controlling the inlet to and the delivery from saidcylinders, pistons in said cyl'in ders, a'piston rod connecting said pistons, a crank shaft journaled in the casting of the following cylinder beyond the working spacethereof, a crank secured to said shaft,

and rod connecting the following piston with said crank.

2. A pump or compressor com-prising'in tion to one of said spaces and an outlet connection to the other of said spaces, a valve casting uniting said cylinders, valves in said valve casting controlling the inlet to and the delivery from said cylinders, pistons in said cylinders, a piston rod connecting said pistons, a crank shaft j ournaled in the casting of the lower cylinder below the working space thereof, a crank secured to said shaft, and a rod connecting the lower piston with said crank.

3. In a pump the combination of two 00- axial cylinders, pistons in said cylinders, a piston rod joining said pistons, and a valve structure located between said cylinders, said valve structure comprising inner ported members carrying inlet and outlet valves for each cylinder and a surrounding union member completing with said ported members channels connecting said inlet and outlet valves respectively with inlet and outlet openings.

4. In a pump or compressor the combination of two co-axial cylinders, pistons moving therein, a piston rod joining said pistons, and a valve structure located between said cylinders, said valve structure comprising inner ported members having co-axial annular valves closing inlet and outlet ports for each cylinder separated by partition walls, and an outer union member surrounding said ported member and making joint with the partition walls thereof so as to complete channels from said annular inlet and outlet ports to inlet and outlet openings respectively.

In a pump or compressor the combination of a cylinder, a flange formed upon the end of the cylinder, a valve structure seated upon and making joint with said cylinder and its flange and carrying inlet and outlet valves for said cylinder and also a second set of inlet and outlet valves, a second cylin- 1 der seated upon and making joint with said valve structure so that said second set of valves gives ingress into and egress from seated upon and making joint with said a cylinder carrying inlet and outlet valves for said cylinder and also a second set of inlet and outlet valves and having inlet and outlet openings connecting with said inlet and outlet valves respectively, a second cylinder seated upon said valve structure so that the second set of valves therein gives ingress into and egress from said second cylinder at one end thereof, a second valve structure carrying inlet and outlet valves at the other end of said cylinder, and an outer casting integral with said cylinder and having separate channels thereln connecting the inlet and outlet valves of said second valve structure with the inlet and outlet openings of said first valve structure.

7. In a pump or compressor the combination with a single-acting cylinder of a double-acting cylinder co-axial therewith, a valve structure located between said cylinders common to both of them having inlet and outlet openings, a second valve structure at the other end of said double-acting cylinder, and a casting integral with said double-acting cylinder having separate passages formed therein connecting the inlet and outlet valves of said second valve struc- .ture with the inlet and outlet openings of 

